EP0190644B2 - Convertor pressure control device in convertor waste gas disposing device - Google Patents

Convertor pressure control device in convertor waste gas disposing device Download PDF

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Publication number
EP0190644B2
EP0190644B2 EP86101093A EP86101093A EP0190644B2 EP 0190644 B2 EP0190644 B2 EP 0190644B2 EP 86101093 A EP86101093 A EP 86101093A EP 86101093 A EP86101093 A EP 86101093A EP 0190644 B2 EP0190644 B2 EP 0190644B2
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EP
European Patent Office
Prior art keywords
converter
pressure
waste gas
convertor
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86101093A
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German (de)
English (en)
French (fr)
Other versions
EP0190644B1 (en
EP0190644A1 (en
Inventor
Nobuhiro C/O Nippon Steel Corp. Sakanashi
Toru C/O Nippon Steel Corp. Yoshida
Yujiro C/O Nippon Steel Corp. Ueda
Katsumi Hachiga
Shigeharu Kawai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Nippon Steel Corp
Original Assignee
Fuji Electric Co Ltd
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Fuji Electric Co Ltd, Nippon Steel Corp filed Critical Fuji Electric Co Ltd
Publication of EP0190644A1 publication Critical patent/EP0190644A1/en
Publication of EP0190644B1 publication Critical patent/EP0190644B1/en
Application granted granted Critical
Publication of EP0190644B2 publication Critical patent/EP0190644B2/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4673—Measuring and sampling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/30—Arrangements for extraction or collection of waste gases; Hoods therefor
    • F27D17/302—Constructional details of ancillary components, e.g. waste gas conduits or seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
    • F27D2019/0009—Monitoring the pressure in an enclosure or kiln zone

Definitions

  • This invention relates to a converter pressure controlling device implementing an improved procedure for controlling converter control parameters for a converter waste gas disposing device.
  • the waste gas produced in blowing oxygen gas against molten iron in an oxygen-operated converter is generally a valuable gas that essentially contains carbon monoxide (CO) gas.
  • the gas is recovered by cooling it and removing entrapped dust.
  • a suitable space is provided between a movable skirt, which is disposed between the opening of the converter and the hood, and the opening of the converter.
  • the gas pressure in the hood substantially equal to the atmospheric pressure.
  • the gas pressure in the hood hereinafter referred to as «the pressure in the converter» or «the converter pressure»
  • «the pressure in the converter» or «the converter pressure» is detected, and the flow rate of waste gas is controlled so that even if the production of gas in the converter varies irregularly, the pressure in the converter is maintained constant.
  • the above-described converter pressure control sometimes fails to follow the change because of a delay in detecting the change, in transmitting the signal representing the gas pressure, or in responding at the control terminal.
  • the waste gas may blow out of the converter through the gap between the skirt and the opening of the converter, or air may be forced into the converter through the gap to cause the combustion of the carbon monoxide gas, which is not economical.
  • the operator must manually adjust the gap by moving the skirt vertically.
  • a PI or PID controller for converter pressure control has control parameters such as a proportion gain (Kc) in a proportion operation, a time constant T I in an integration operation, and a time constant (T D ) in a differentiation operation. These parameters are set to suitable values according to the process characteristic of a system to be controlled. Therefore, if when the process characteristic of the system to be controlled changes the parameters remain unchanged, then the control operation may become unstable.
  • Kc proportion gain
  • T I time constant
  • T D time constant
  • the proportion gain Kc in the case where the gap is small, the pressure in the converter is greatly changed when the waste gas flow-rate control device is driven, and, therefore, the proportion gain Kc must be small. If the proportion gain Kc is small in the former case where the gap is large, the operation of the controller becomes slow, as a result of which the pressure in the converter is greatly changed. Accordingly, a large quantity of air goes into the converter through the gap so that the CO gas to be recovered is burned, or the waste gas blows out of the converter through the gap to cause air pollution. On the other hand, if the proportion gain Kc is small in the latter case where the gap is small, the pressure in the converter oscillates, and the control operation becomes unstable.
  • the control parameters can be adjusted for the gap between the skirt and opening of the converter.
  • in the above described relation (1) has not been a serious factor because, when the gap between the skirt and the opening of the converter is large, the variation of the converter is not more than 5 or 6 mm H2O.
  • the converter pressure is varied more than 100mm H2O with the same variation of the quantity of gas produced in the converter. Therefore, according to the above-described relation (1) the process gain become ten times as large. Accordingly, even if the control parameters are adjusted for the gap between the skirt and the opening of the converter, the pressure in the converter will oscillate. As a result, it becomes impossible to continue the smelting operation.
  • An object of the present invention is a converter pressure control device in a converter waste gas disposing device that operates in a stable manner.
  • Another object of the present invention is the efficient recovery of waste gas generated during smelting operations.
  • a further object of the present invention is a converter pressure control device that responds quickly to changes in smelting conditions during the recovery of converter waste gas.
  • Still another object of the present invention is a converter pressure control device in a converter waste gas disposing device which is capable of accommodating large variation in smelting conditions.
  • a converter pressure control device for use in a converter waste gas disposed device comprising means for detecting the pressure in a converter, calculating means for determining a variation in a characteristic parameter of the waste gas disposing device from the difference between the detected converter pressure and atmospheric pressure, in accordance with a square root of an absolute value of said pressure difference parameter determining means for determining an operating parameter in accordance with the variation in the characteristic parameter, converter pressure controlling means for comparing the detected converter pressure with a predetermined value and for generating a control signal corresponding to the difference between the detected converter pressure and the predetermined value and to the operating parameter, and means for controlling the flow rate of waste gas produced in the converter according to the control signal to establish the pressure in the converter at a predetermined value.
  • the control parameters are adjusted for variations in characteristic parameter or parameters of a waste gas disposing device which are due to a large variation in converter pressure, so that the smelting operation may be carried out safely and stably.
  • Fig. 1 is an explanatory diagram outlining an embodiment of the present invention.
  • a converter waste gas disposing device OG
  • scrap iron and molten pig iron 2 are put in the converter 1
  • high pressure oxygen gas is blown, through a pipe 3 against the scrap iron and molten iron 2. That is, a so-called «blow type» smelting operation is carried out.
  • the converter 1 is tilted to dump out the produced steel.
  • the oxygen gas jet through the pipe 3 reacts with the carbon C of the molten pig iron to produce a large quantity of waste gas rich in carbon monoxide CO.
  • the surface of the steel bath, against which the oxygen gas jet strikes is heated to a considerably high temperature than the rest of the molten steel so that the iron (Fe) of the steel bath is vaporized causing a large quantity of iron oxide powder to be produced.
  • the waste disposing device is made up of a section for cooling a large quantity of high-temperature waste gas, and a section for collecting dust.
  • the large quantity of high temperature waste gas produced is sucked by an induction blower 11 through a flue.
  • the waste gas is cooled by a gas cooler 7 made up of a number of cooling water pipes for instance.
  • Coarse dust is collected by a primary dust collector 6, and fine dust is collected by a secondary dust collector 8, to purify the waste gas.
  • the purified waste gas flows through the induction blower 11, and is recovered as fuel by a gas holder or the like (not shown).
  • a large quantity of waste gas is produced during the middle period of the blow type smelting operation; however, the quantity of waste gas produced in the initial or final period thereof is relatively small.
  • the flow rate of the waste gas is controlled. In accomplishing this, the gas pressure Po in the hood 5 (hereinafter referred to as «the pressure in the converter», or «the converter pressure») is detected.
  • the detected gas pressure value is applied to a controller 14 by a converter pressure signal generator 12.
  • the gas pressure value is compared with a predetermined value, and an operating output signal is applied to a damper operating unit 15 so that the difference between the two values is zeroed.
  • the opening and closing operation of secondary damper 9 is controlled, whereby the flow rate of the waste gas is controlled.
  • a skirt 4 In a closed-type smelting operation, which is carried out to increase the quantity of waste gas recovered, a skirt 4 is moved downwardly until it is brought into close contact with the opening of the converter. An outside seal 19 may also be closed in order to further increase the degree of closure. In a blow type smelting operation under this condition, the converter pressure is greatly changed.
  • control gain of the controller 14 is determined as follows: The difference between the measured converter pressure Po and the atmospheric pressure Pa is detected, and with the aid of calculator 16, a process gain Kp and a proportion gain Kc are obtained according to equations (2) and (3), respectively. The difference thus detected is to determine the control gain of the controller 14.
  • the integration time constant and the differentiation time constant concern delay time constants in the process to which the present invention relates.
  • the delay time constants are as follows: Damper time constant: T1 Damper waste time: T L Process time constant: T p
  • T P and Pa-Po the following relation can be established similarly as in the equation (1): T P ⁇
  • T PO 1 2 ⁇ (T IO -2T L )
  • T I 2T L +
  • T D 0.42T L + Pa-Po (T DO -0.42T L )
  • control parameters, the integration time constant T I , and the differentiation time constant T D can be set to suitable values by utilizing the difference between the converter pressure Po and the atmospheric pressure Pa.
  • the converter pressure control device of the present invention works satisfactorily under severe operating conditions, and contributes to an improvement in the percentage of recovery of waste gas and the safety of the smelting operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP86101093A 1985-01-28 1986-01-28 Convertor pressure control device in convertor waste gas disposing device Expired - Lifetime EP0190644B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP60012568A JPS61174309A (ja) 1985-01-28 1985-01-28 転炉廃ガス処理装置における炉圧制御装置
JP12568/85 1985-01-28

Publications (3)

Publication Number Publication Date
EP0190644A1 EP0190644A1 (en) 1986-08-13
EP0190644B1 EP0190644B1 (en) 1989-04-12
EP0190644B2 true EP0190644B2 (en) 1992-04-01

Family

ID=11808955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101093A Expired - Lifetime EP0190644B2 (en) 1985-01-28 1986-01-28 Convertor pressure control device in convertor waste gas disposing device

Country Status (5)

Country Link
US (1) US4767103A (enrdf_load_stackoverflow)
EP (1) EP0190644B2 (enrdf_load_stackoverflow)
JP (1) JPS61174309A (enrdf_load_stackoverflow)
KR (1) KR930007310B1 (enrdf_load_stackoverflow)
DE (1) DE3662792D1 (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01100215A (ja) * 1987-10-14 1989-04-18 Nippon Steel Corp 転炉廃ガス処理装置におけるスカートの自動昇降制御方法
US5341288A (en) * 1992-05-27 1994-08-23 The Foxboro Company Method and apparatus for analyzing process characteristics
EP0647175B1 (de) * 1993-04-05 1998-10-14 ProControl AG Spritzgiessmaschine mit elektrischem antrieb sowie verfahren zur führung derselben
JP6264943B2 (ja) * 2014-02-28 2018-01-24 新日鐵住金株式会社 転炉脱炭処理方法
CN108416147B (zh) * 2018-03-13 2021-12-03 安徽工业大学 一种转炉一次除尘og系统参数计算机辅助设计方法
CA3133389A1 (en) * 2019-04-15 2020-10-22 Arcelormittal Method to control exhaust fumes aspiration during a steelmaking process

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1549489A (enrdf_load_stackoverflow) * 1967-10-31 1968-12-13
JPS5258005A (en) * 1975-11-09 1977-05-13 Kiyotoshi Sakai Method for pressure control of shaft furnace
US4314694A (en) * 1975-12-20 1982-02-09 Nippon Steel Corporation Method for controlling exhaust gases in oxygen blown converter
JPS5289503A (en) * 1975-12-20 1977-07-27 Nippon Steel Corp Recovery of uncombustive exhaust gas from converter
GB1603825A (en) * 1977-05-17 1981-12-02 Jones K R Three term (pid) controllers
JPS5839204B2 (ja) * 1979-04-09 1983-08-29 新日本製鐵株式会社 転炉廃ガス処理装置における炉内圧制御装置

Also Published As

Publication number Publication date
KR860005887A (ko) 1986-08-13
JPS61174309A (ja) 1986-08-06
KR930007310B1 (ko) 1993-08-05
DE3662792D1 (en) 1989-05-18
US4767103A (en) 1988-08-30
EP0190644B1 (en) 1989-04-12
JPH0419282B2 (enrdf_load_stackoverflow) 1992-03-30
EP0190644A1 (en) 1986-08-13

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